Fan blade attachment



Allg. 2, 1932. 1 P, DQRE 1,8695802 FAN BLADE ATTACHMENT Filed July 13.1951 y ,oy-'ZWQW hlm. gofmph Dom Patented Aug. 2, 1932 vUNITED STATES'PATENT OFFICE JOSEPH I. DORE, or HOLLAND, MICHIGAN, AssIoNon To HOLLANDFURNAOE COMPANY,

or HOLLAND, MICHIGAN, A CORPORATION OF MICHIGAN FAN BLADE ATTACHMENTApplication illed July 13,

This invention relates to a fan structure and more definitely pertainsto a fan located at the top Of a hot air furnace jacket to draw the airupwardly and then force the air outf wardly, thus Creating artificialcirculation of the air through the system.

1t has been common practice to utilize a fan in heating systems of thischaracter; but the type of fan utilized has been the common radialinclined blade type, with the result that the fan largely churncd theair within the jacket in which it operated and consequently theefficiency of such a fan was eX- tremely low. Now, in my type of fan, leliminate the disadvantage just set forth7 due to the novel shape ofmyfan.

It will be noted that the blades on my fan are so shaped as to serve adouble purpose. The blades first draw the air upwardly into the plane inwhich the fan is rotating and then the upper portion of the blades forcethe air radially of the fan. Thus I obtain a high degree of efciency.

Another advantage of my device resides in the construction of the fanitself. The curved portions of the blade are .formed of thin metalwhereby they may be easily trimmed to the desired shape after they vhavebeen installed. This is necessary because constant-speed motors areutilized 'in driving fans of this type and hence regulation of theamount of air handled by the fan must be secured by some otheradjustment than the speed of the motor.

Briefly described. my invention consists of a fan of the shape disclosedrevolubly mounted at the top of the warm air jacket.

The air enters into the plane of the fan.'

through a battle ring located immediately therebelow. lt will be notedthat the inlet opening to tl e fan is of substantially the same diameteras the fan. This is necessary because oftentimes it is desirable to usethe air system without running; the fan. and in order that the' How ofair through the fan area 1931. Serial No. 550,429.

may be unimpeded a large opening is necessary. When the fan is running,the air from the furnace {iows upwardly in the usual manner and thelower edges of the blades draw this air upwardly, the entire radiallengths of the blades being effective during this Operation. After theair is drawn upwardly, the upper curved portions of the blades act incentrifugal fashion to throw the air out wardly into the outlet pipes.

The further Objects and advantages will be obvious to one skilled in theart without further description.

In the drawing i Fig. 1 is a view in cross section taken through afurnace installation equipped with my type of fan structure.

Fig. 2 isa perspective view of the fan.

Fig. 3 is an end view of Fig. 2.

Similar numerals refer to similar parts l throughout the several views.

As shown in the drawing` 10 indicates a furnace body surrounded by afurnace acket 11, this furnace jacket having a concaved top l2 and warmair outlet pipes 13 leading therefrom. The furnacel() heats the airsurrounding the same and the air'rises` upwardly in the usualmanner. l

A bathe ring 15 is fastened to the jacket 11 below the outlet pipe 13and this baffle ring guides the air slightly inwardly, whereby the fanwill operate thereon and prevent back eddies from occurring.

A bearing member 16 is rigidly mounted upon the conical portion 12 ofthe jacket, and a shaft 17, having a driving pulley 18, is rotativelymounted in the bearing member 16. This shaft extends downwardly andsupports the fan.

Referring particularly to Figs. 1 and 2, 20

indicates the hub of the fan, this hub having a hole 2l therethrough forreceiving the shaft 17and rigidly attaching the shaft 17 to the fan bymeans of the disk 19. Thus, the rotation of the driving pulley 18 causesthe fan to revolve. Inclined radial blades or vanes 22 are integrallyformed with the hub 20 and extend outwardly therefrom. Each of theseblades 22 has a scoop member 23 rigidly attached thereto by means of thebolts 24. The members 23 are preferably formed of a light sheet metalwhereby they may be readily trimmed or cut to the desired shape aftertheir installation. As previously set forth, this is necessary, in orderto regulate the amount of air thrown thereby. The outer ends of thescoops are of considerable greater width than the inner portions becausethe air handled by the scoops increases as the outer edge thereof isapproached. In other words the air passing upwardly from the furnace l()is acted upon along the entire lower edge of the blades 22 and then thescoops 23 force the same outwardly and the volume of the air isincreased as the outer edges of the scoops are approached. This will bereadily understood by those skilled in this art.

reciated that I have created a fan which 1s particularly effective incombination with a jacket of the character described. That is, theinletto the fan is of substantially the same size as the fan itself andconsequently the fan must be of such a. design as to act upon a volumeof air passing through the large inlet opening. Furthermore, the fanmust then act upon the'air to divert or force the same outwardly withoutchurning the air with a large loss in eiciency. Moreover, the systemwill operate when the fan is station- 5Irlavng thus revealed myinvention, I claim as new and desire to secure the followingcombinations and elements by Letters Fatent of the United States.

I claim:

1. In a device of the class described, a cylindrical, jacket having aclosed end and a lateral outlet near said closedl end, a fan rotatableon an axis substantially coincident with the axis of said cylindricalshell, said fan consisting of a dat hub portion, two blades extendingradially from said hub portion at opposite Vangles thereto, said bladesbeing attached to the flat hub portion, a scoop member detachablyfastened to each blade parallel to but spaced from the forward edge ofthe respective blade, said scoop member curving upwardly and rearwardlyfrom said blade for the purpose described.

2. A combination of elements as set forth in claim l but furthercharacterized by the fact that the scoop members are of greatest depthnear their outer edges and taper inwardly therefrom.

In combination, a fan comprising a fiat rectangular strip of metal bentto form a Hat hub intermediate its ends and two oppositely inclinedblades at its ends, said blades and hub being connected by shortportions, a scoop member detachably mounted. upon either bladerearwardly from its leading edge, said scoop members being of relativelylight material and curving upwardly and of greater depth at their outerends for the purpose described.

In testimony whereof I aix my signature.

JOSEPH P. DORE.

From the above description it will be ap` Y

